通过SQL查询从WordPress获取帖子数据

Question

I want to get wordpress post data and get wp_attached_file from wp_postmeta table this is my sql query

$query= mysql_query("SELECT wp_posts.ID,wp_posts.post_title,wp_posts.post_date,wp_postmeta.meta_value 
                FROM wp_posts

                  JOIN wp_term_relationships
                        ON wp_term_relationships.object_id = wp_posts.ID

                    JOIN wp_postmeta
                        ON wp_postmeta.post_id = wp_posts.ID

                WHERE wp_posts.post_date > '$before7' 
                AND wp_posts.post_status = 'publish' 
                AND wp_posts.post_type = 'post' 
                AND wp_term_relationships.term_taxonomy_id = '$cat' 
                AND wp_postmeta.meta_key = '_wp_attached_file' 
                ORDER BY wp_posts.post_date DESC LIMIT 10");

it give me nothing but if I removed this line from where clause

AND wp_postmeta.meta_key = '_wp_attached_file'

it works but I need this line to get wp_attached_file

so what is wrong with mysql query

Answer 1

确保值_wp_attached_file的wp_postmeta.meta_key确实存在，然后匹配可能存在一些问题，请尝试修剪两者均导致隐藏字符

  AND trim(wp_postmeta.meta_key)  = trim('_wp_attached_file')